Waterproofing for cloth



Patented July 22, 1924.

UNITED STATES NATHANIEL A.,THOMPSON, OF KANSAS CITY, KANSAS.

WATERPROOFING FOR CLOTH.

Ho Drawing.

To all whom it may cmwmm:

Be it known that I, NATHANIEL -A. THOMPSON, a citizen of the UnitedStates, residing at Kansas City, in the county of Wyandotte and State ofKansas, have invented certain new and useful Improvements inWaterproofing for Cloth, of which the following is a specification.

The object of this invention is to make a .more perfect water-proofingfor cloth that will shed the water under any conditions of weather.Cloth treated by this process has its period of life increased for notonly is the fabric protected from moisture, but the ingredients thatrender it water-proof have no deleterious effect on the fibers.

Because of the excellent water-proofing action of the ingredients asused in my process, the cloth is not stiff as is the case with ordinarywater-proofin goods, for a thinner coating accomplishes tie same result.

Another object of my process is to produce a cloth which will beabsolutely impervious to water and will not crack when folded.

With these and other objects in view, the invention consists of aprocess as herein set forth, with the understanding that the severalnecessary elements entering into the composition may be varied inproportion without departing from the nature and scope of the invention.

To make the water-proofing, a small quantity of rubber is cooked inboiling oil until the rubber has become thoroughly dissolved. Any of theheavier hydro-carbon oils may be used or a vegetable oil, as linseed orcottonseed oil. The vegetable oils have been found to be superior to themineral oils, but it' will be understood that the invention is notlimited to the exact type of oil used.

To the hot mixture of oil and rubber is added a small quantity ofasphalt. To this mixture isthen added a finely comminuted filler, suchas pulverized calclum carbonate or ferric oxide. The'exact compositionof the body does not form part of this invent1on as any ofthe insolublemineral salts or oxides accomplish the same result.

It has been found by actual experiment Application March 8, 1923. SerialNo. 623,725.

that good proportions of the ingredients used are as follows:

Oil 40 to per cent Rubber 5 to 10 per cent Asphalt 5 to 10 per centFiller 30 to 50 per cent The stiffness of the compound is determined bythe proport-ion of the filler added.

The rubber has the property of acting as a binder to keep the asphaltfrom separating from the oil which would otherwise be its tendency whenallowed to stand. The asphalt likewise keeps the finely ground filler insolution and does not allow it to precipitatc. Thus it will be seen thatthe greater the amount of ground filler added the greater the amount ofasphalt necessary and likewise the greater the quantity of rubber. Therubber has the complemental effect on the asphalt that the asphalt hason the filler, i. e., that of holdin it in solution or of forming ablend. W en the water-proofing composition has been prepared a propercolorin may be given to it by means of any suita le pigment.

The water-proofing composition may be applied to the fabric by means ofa brush or roller and the fabric is allowed to dry or set from nine toeleven days. The composition has a tendency to become very viscid, due,it is thought, to the oxidizing influence of the air and at the end ofnine or eleven days, depending on the temperature and proportion ofingredients used in the composition, the fabric is coated with awater-proofing that is absolutely and uniformly impervious to waterbecause of the perfect blend between the different constituents and theeven grade of the compound, regardless of the length of time it hasremained in the container.

' What I claim is 1. A water-proofing composition com posed of a viscidvegetable oil, approximately 40 to 50 per cent, rubber 5 to 10 per cent,asphalt 5 to 10 per cent, and a filler of 30 to 50 per cent.

'2. A water-proofing composition composed of cotton seed oil,approximately 40 to 50 per cent, rubber to per cent, asphalt 5 to 10 percent and a filler 30 to 50 per cent.

3. A process for makin water-proofing composition consisting of oiling aviscid vegetable oil with rubber, adding asphaltand then addin a filler.

a water-proofing oilin cotton seed ng aspha t and then 4. A process ormaking) composition consistin of oil with rubber, 216151 adding afiller.

5. A process for making a water-proofing composition consisting ofboiling 40 to 50 parts of a viscid vegetable oil wlth 5 to 10partsrubber, adding 5 to 10 parts asphalt and then adding a filler of 30to 50 parts.

6. A process for making a water-proofing composition consisting ofboiling 4:0 to 50 parts of cotton seed oil with 5 to 10 parts rubber,adding 5 to 10 parts asphalt, and then adding a filler of to parts.

In testimony whereof I aflix my signature NATHANIEL A. THOMPSON.

